I use an older addition of this book:
https://www.amazon.com/Danish-Comprehensive-Grammar-Routledge-Grammars/dp/0415491932/ref=sr_1_fkmrnull_2?crid=28JFIBDGXZ3CK&keywords=danish+a+comprehensive+grammar&qid=1554912808&s=books&sprefix=danish+a+%2Caps%2C214&sr=1-2-fkmrnull